@book{2356,
	author = {Hempel, Carl G.},
	title = {Filosofia de la ciencia natural /},
	publisher = {Alianza Universidad;},
	year = {1977.},
	address = {Madrid:},
	edition = {3a ed.},
	note = {Hempel, C. G. (1977). Filosofía de la ciencia natural. (3a ed.). Madrid : Alianza Universidad.}
}